HI Billie,
I flat iron my bangs too--which is obvious if you look at my picture, right?
I've had very good luck with Icon products. For shampoo I use "Drench" and condioner I use "Free." For leave in conditioner I use spray product called "Cure" or another one that's similar, but I can't remember the name of it.
My favorite Icon product, "Bright" has been discontinued and I'm using my last package of it now, so I need to find a replacement. It's a silica-gel product I put on my wet hair (to lock in moisture) before I put on the mousse.
I was amazed when I tried Paul Mitchell Mousse--recommended by a friend with similar hair. Until I found PM mousse, I had to blow dry my hair with a diffuser. If it was even the littlest bit wet it would frizz like nobody's business. With PM mousse, I can apply it and let my hair air dry, whch also cuts more frizziness and volume. When I wake in the morning, I apply the "Bright" again to my (mostly) dry hair and it helps cut the frizz and give a little shine.
For me, the thing that's helped my breakage and split ends is that I don't blow dry my hair any more, that I ony comb it out wet (with tons of conditioner and not again until I wash it again), constantly trimming the split ends, and the Tangle Teaser:
http://www.tangleteaser.com/ I was using a wide tooth comb, and I noticed a huge difference. A friend who was using a sponge-back brush didn't notice as huge a difference as I did, so maybe try that first if you have one.
Constant trimming the ends, though, does help. And hydrating conditiners and shampoos. I pay more attention to hydrating than to shampoos for curly hair or colored hair. Hydration for hair as dry as mine is more important. Perhaps for you too? I also use 9-11 and Biolage shapmoos & conditioners. As I said in a previous post, I rotate my shampoos & conditioners.